If you’re not a big fan of storing your notes on a third-party service like Google Keep or Evernote, Paperwork is similar software that’s open-source that also allows you to host it yourself.

Paperwork isn’t nearly as complex as something like Evernote, but it does have a lot of the more useful features. You can create various notebooks to store you notes in, build a tagging system, support multi-media uploading, and use WYSIWYG editing. There aren’t any mobile apps or anything, but if you’d prefer to keep your notes in your own hands, it’s a pretty solid alternative.